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Energy Intake And Body Weight Loss After Gastric Bypass

Reduced Calorie-Intake After Bypass

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Factors Influencing Energy Intake And Body Weight Loss After Gastric Bypass

The gastric bypass-induced quantitative and qualitative modifications of energy intake (En In, kcal/day) and their impact on body weight (bw) loss were evaluated. The factors influencing energy intake and body weight loss were also investigated.

Method

We studied 50 obese women undergoing a Roux-en-Y gastric bypass.

Results

The reduction of energy intake was significantly related to body weight loss expressed either in kg or as percentage correction of excess body weight, whereas the post-operative modifications of diet composition did not play a role. Age and initial body weight significantly influenced body weight loss, as shown by multiple regression analysis. Patients were divided into four sub-groups according to their age (under or over 35 y) and initial body weight (under or over 120 kg). ANOVA showed that under 35-year-old subjects reduced their energy intake significantly more than their older counterparts having similar body weight; consequently, weight loss, expressed in kg, was significantly larger in younger patients. Subjects with an initial body weight over 120 kg lost significantly more weight as compared to patients with a smaller degree of obesity (under 120 kg) and similar age.

Conclusion

Gastric bypass-induced body weight loss is mainly due to the reduction of energy intake, whereas the qualitative modifications of the diet do not play a role. Younger subjects have a greater capacity to reduce energy intake and, therefore, lose more weight. Pre-operative high degree of obesity leads to a larger weight reduction, probably because of a greater energy deficit.

Source:
Bobbioni-Harsch E, Huber O, Morel P, Chassot G, Lehmann T, Volery M, Chliamovitch E, Muggler C, Golay A. Division of Therapeutic Education for Chronic Diseases, Geneva University Hospital, Geneva, Switzerland.

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Laparoscopic or open bariatric surgery, such as gastric banding or bypass is not an easy solution to morbid obesity and weight loss. It is a serious surgical procedure, involving health risks. To produce lasting weight loss it requires a long-term patient commitment to eating a healthy diet and following a regular program of physical exercise. Life-long use of nutritional supplements may also be necessary. So, before deciding, discuss your options fully with your doctor. © 2003-2017 Bariatric-Surgery.Info - Terms - Contact - Information - Resources